package com.xs.ahoi.hcxs.handler;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.widget.Toast;

import com.xs.ahoi.hcxs.utils.Constants;
import com.xs.ahoi.hcxs.utils.DateUtil;
import com.xs.ahoi.hcxs.utils.FileUtil;
import com.xs.ahoi.hcxs.utils.LogUtil;
import com.xs.ahoi.hcxs.utils.ThreadPoolFactory;

import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class CrashHandler implements UncaughtExceptionHandler {

    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<>();

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     */
    public void init(Context context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
//            try {
//                Thread.sleep(3000);
//            } catch (InterruptedException e) {
//                LogUtil.e("error: ", e);
//            }
//            // 退出程序
//            Ahoi.getInstance().removeAll();
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(final Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 显示异常信息
        ThreadPoolFactory.getInstance().execute(() -> {
            Looper.prepare();
            ex.printStackTrace();
            Toast.makeText(mContext, "很抱歉,程序出现异常", Toast.LENGTH_LONG).show();
            Looper.loop();
        });
//        // 收集设备参数信息
//        collectDeviceInfo(mContext);
        // 保存日志文件
        LogUtil.e("收集到未捕获异常!", ex);
        return true;
    }

    /**
     * 收集设备参数信息
     */
    private void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            LogUtil.e("an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
//                LogUtil.e(field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                LogUtil.e("an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     */
    private void saveCrashInfo2File(Throwable ex) {
        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(DateUtil.date2String(new Date(), DateUtil.FORMAT_YMD_HMS) + result);
        try {
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                FileUtil.checkAndCreateDir(Constants.ERROR_LOG_PATH);
                FileOutputStream fos = new FileOutputStream(Constants.ERROR_LOG_PATH, true);
                fos.write((sb.toString()).getBytes());
                fos.close();
            }
        } catch (Exception e) {
            LogUtil.e("an error occured while writing file...", e);
        }
    }
}
